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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089502da76b957e988226734d10397c67f74c2456b6ccb7cd33448e1fc47a487' 
  AND token = 'rkiaC/+q+j/AE/yaSIxuw7vf3ZiBGrswvO77WN1UwvQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

{
  "query_block": {
    "select_id": 1,
    "table": {
      "message": "Impossible WHERE noticed after reading const tables"
    }
  }
}